Double-end can-seamer.



C. LEFFLBR.

DOUBLB'END GAN SEAMER. 'APPLIUATION FILED 441511.15, 1911.

Patented B60111912.

G.LBPPLBR. l DOUBLE BND GAN SBAMER.

- APPLICATION FILED APR.15, 1911'. w Y. 1,047,656, Patented Dec. 17,1912.

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C. LBFFLBR. DOUBLE END CAN SEAMBR. APPLICATION rILnD un. 15. 1911.

Patented DBO. 17, 1912. 5 SHEETS-SHEET 3.

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C. LEFPLBR. DOUBLE BND GAN SBAMER. AIPLIOATION FILEDAPR. l5, 191i 1,047,666. Patented Dec.17,1912.

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W12/[Summa: Y 5 vw@ wko@ C. LEFPLER. DOUBLE' END GAN SBAMBR.

APPLIQATIOB FILED APB. 15, 1911. l Patented Dec. 17,1912.

UNITED STAWENT oFFioE.-

CHARLES LEFFLER, oF NEW Yomr, N. Y. l

v DOUBLE-END CAN-SEAMER.

To alll whom it may concern:

Be it'known that I, CHARLES LEFFLER, a citizen of the United States, residing at the city of New York, in the borough of Brooklyn and State of'New York, have invented certain" new and useful Improvements `in DoubleEnd Can-Scanners, of which the following is a. full, clear,`and exact description. A

This invention relates to machines' for uniting the body and ends of met-al cans or vessels by means of 'suitable seams, and especially to a mechanism for forming such seams in vessels or cans of other than cylindrical shape, such for instance, as rectangu- ,i lar` or triangular vessels.

One ofthe objects of my linvention is to produce a machine which shall he practi-l cally wholly automatic in its operation, relatively simple in construction, and capable of turning out good Work rapidly'. A

I further aim herein to expedite the manufacture of cans by performing t-wo seaming operations simultaneously, the seams 'so formed being preferably what are known as double" seams. v

In some of its aspects the machine inV question is an improvement upon the double sea-ming machine described in my r Patent No. 648,037, since heretoforeit has been possible to seam'only one end at a time of cans of vsquare or irregular shape, and it is be? lieved ythat the herein described mechanism, adapted as it is to automatidally double seam the tops and bottoms to the bodies 'of such square or irregular cans, represents' a decided. advance in the art. In general therefore while the mechanism in question'relates to that Ageneral class of can seamers in which an edge of a ca-n' is seamed by forming and sealing -dies which by 'reason of a suitable pattern'fcam'are caused to follow the generalcontour of thecan and press an edge of the sanieinto shape,'by` reason of the; novel4 construction now femployed', the said mechanism is' adapted I t'o operate -upon nEluraliftyy offcdges: of suchlapan"imlultaiti' the objects if myjln'e 1nL ftne'` Atlrafwin'gswhich form part here? 'of f Yand j 1n which Alike v'reference v characters 'forth v'and speciaeation of Letters Patent. s jmlted.

Application led April-15., 1911. Serial No. 621,213.

designate like parts throughout"the,Y several views: F igurel lsaslde 'elevation'of'orre en Abodiment of my invention,fa`rsi alll s'ecvti'oii,4V .of the treadle latch' lever being broken awayf to show the construction oit'i'thisy part. `.11"i`gl 2 is afront elevation off the' machinefpo tions 0f the die carriages hereinafter 'def scribed being broken awayffor*convenience in illustra-tion. Fig. 43 is a vertical'parti'a "I I section taken substantially on the' median line of the elevation shown in'Fig. Fig.;

4C is a partial plan View'. Fig".l detail.V section of the upper' and lower ,seeming5 mechanisms proper. Fig. 6j isfa' 'detail' sec-f tion 'of the said sea-ming' mechanisms'takenf o'n line VI-.-Vl ot. Figf'., butshowing a' fore the seeming operationhas-begun. Fig.

the completion oi' said operation."v

. The machine illustratedinthe VIaccompia?" nying drawmgs has a base l from whichex-V I can '.inifposition therebetween.""'Figf ,"'i's ,d etail'. section showing the' relative disposi-'1f tio-n of the rollers and can torming'parts'bel" tends upwardly 'a standard-:'Z'fwhich 'standf ard carries the drivingmechanisin 'andmos'tf of the operative parts o'thedevice. *l

` Driving mechanism.e-Laterally projecting from the rear of the standard is a bracket-3 2 which is provided with lbearings wherein: is journaled a' drivejshaft *3;* which carries fa pulley 4, preferablyfof the Vsteppedtyp'njand the inner side of iev pulley*adjacent`T the' standard is pocketed to form 'al se'atiorI al' friction clutch member 5, the engagingiwalfls of the pocket and clutch'member'being'pref era'bly slightly tapered-,in the usualV` manner! The clutch member 5 is sec'uredtofasleeve 6 which-is adapted. to be moved?. r'e'elyi` lons? gitudinally of shaft 3," and the'vi'orward end' ofthis sleeve Carriesa friction' disk v-which is `adaptedL to .engage aeorrespondin-g disk 8',`fthe latter being tixediy mcuntediupon the; adjacent ibearing 9. Disks' 27 and i8-consti-ef tuteit fbral're, the purpose llof-whichA` will here- 1 2. terred to: 3 Shaft 3 fis"`4 adapted: toi'drive awvei'ticalsha'ft 1.140 bymeansf: oiff beveled .gea-r connections 211, anclshaftv 1011V infturn is'ada-pted toy 'drive-'stiva preferably horizon-tal and .parallel countershafts ;respec"-.

ma. i `be f L journaled in suitable bearings disposed the top of the standard, while shaft 13 is 'ournaled in a traveling block broadly designated 14, said block being mounted in a slideway 15 (see Fig. 3) in thev body of the standard. Shaft 12 is driven through the instrumentality of beveled gears- 16, while shaft 13 is driven by means of beveled gears which, for convenience, will be designated pinion 22 which is in mesh with a beveled mounted while shaft 26 is fixed, being held separately as 17 and 18'; gear 17 being feathered upon shaft 10 so as to adapt it for longitudinal movement thereupon. Shaft 12- atv its forward extremity carries a beveled pinion 18 which is meshed with a beveled gear 19, the latter being mounted upon the upper extremity of a preferably vertical spindle 20 which is journaled in a suitable cross-head 21 carried by the upper part of the standard. Correspondingly, the forward extremity of shaft 13 carries a beveled gear 2,3, which in turn drives a vertical spindle 24, the latter being disposed in alinement with spindle 20 and below the same. It may be here noted that gear 23 is also feathered upon spindle 24 so that the said spindleis freely movable longitudinally through this gear.

The head 21 carries two guide rods or shafts 25 and 26; shaft 25 being revolubly against displacement by means of set screws 27, or the like. As viewed in Fig.-2 the right hand extremity of shaft 25 is fitted with a beveled gear 28 which is in mesh with a beveled gear 29, the latter being mounted upon a vertical eountershaft 30, the upper extremity of which is journaled as at 31 in a bearing which depends from the cross-head 21, while the lower extremity of this shaft is journaled as at 32 in a bearing which projects laterally from a second cross-head 33 indirectly carried by the traveling block 14. Immediately above the bearing`32 is disposeda beveled gear 34 preferably of t-he same dimensions as gear 29, and gear 34 is in turn meshed with a gear 35 mounted upon the right hand extremity of a revoluble shaft 36 which corresponds substantially to shaft 25 above referred to, be-

, ing parallel therewith and being in like manner one of a pair of guide shafts, the

ried by the stationary cross-head 21, and at its rear extremity in bearing bracket 41 secured to the side 1of the standard. Shaft 40 is preferably-'driven from shaft 12 by means of a" chain drive, one or more sprockets 42 being mounted upon shaft 12 and corresponding sprockets 43-44 being carried by shaft 40. Sprocket 43 is of smaller diameter than sprocket 44, while the sprockets 42 may be of the same size, but

.one set of said sprockets being connected shafts 25 and 3G are also driven in synchronism with each other.

Traveling Zoe/c and appartewicca-The traveling block 14 has mounted transversely thereof a short shaft 46 which carries a pinion 47 which is adapted?. for engagement with a rack 48 secured to the standard to one side of the slideway 15. Shaft 46 also carries a handwheel 49, by means of which pinion 47 may be rotated, and thereby the traveling block may be raised or lowered, as desired. As shown in Fig. 3, this block bears against finished surfaces 50 upon the front of the standard, and extensions thereof respectively designated 51 and 52 extend rearwardly through the slideway 15fand carry a back or clamping plate 53 which correspondingly engages finished surfaces 54 upon the rear side of the standard.V Bolts and 55 when tightened clamp the standard firmly between the traveling block and its plate 53 and thereby prevent inadvertent displacement of the former, bolts preferably being of somewhat larger diameter than bolts 55 owing to the greater strain placed thereupon when .the mechanism is in operation. lt may be here noted that the shaft 13 above referred to extends through and is journaled in the extension 52 and that the lower extremity of shaft 10 is journaled in bearings 56 'and 56, which bearings are carried by the plate 53.V

Slidably mounted in the front of the traveling block 14 is a journal block 57, which 'carries the cross-head 33 vabove referred to,

being in the exemplification shown integrally united thereto as shown in Fig. 2.

Depending from the cross-head 33 are two posts 58 upon each of which is mounted a clamping block 59 which isadjustable longitudinally with respect to its post and is ati;

mames adapted to be secured thereto in any desired Y A position by ineans of set screws V59. Pivotnefeted ktoblocks 59 are links 60, one off-Which is' disposed upon` either side .finac linegtfhe''t'ree extremities-of these links, beinc es jectiyely connected -a't'l to thegextreinit esl of a bifurc'ated treadle lever brackets Git- 64, the latter being,` tixedlysecure-"editoftheI 'espectire sides of the stand` ard 1 ett therefore the respective np'- per extremities ot' the le'er 62 which extend tn'een tlk -`lotal-fpoints 63 4'and G1, co-act y toto-rin toggle's whereby ook' 57 and its cross head lowered as desired through yineans of the bifurcated the traveling block-,Hand ear led? thereby is preferably *ila'iic'e by 'Weights 65 #by means of i c1115l "sidesof thest'andardlnear top thereof."

f "Cflciiizfsrz'r'ii ,eci/umfat, propere-Having described tfh'e po er transmitting and controlliii der intl'iiig, iet iis say, l2 rotations, although these -relative speeds are Variable. Mounted uponjthe .Quide'fslliafts Q5v andl '26 "are two Y :i kachcarriagebemg adapted to y lclrya djtorth over the'sald shafts. Coirespondinigly, two carriages 69 `are anitednponLilie',lower set of guide shafts lllfo'ur' ott these carriagesv 68 and Lntially' identical, those" uponv h'anldmside of the n iacliine, of I ,ight handed with' respect-to y Y n vthe letti `IT-he said carriages' are h supported bythe respective set-s of i 'hait't "by "incans4 of brackets 70 x cshat-s extend, therebeing 'ori'each carriage.

veinity of the spindle 20 is tfeywlrem A A .,piiovidecl" for 'eac cured by the machine. The carriagesv68 aboye referred to are radially disposed with reference tothe axis offthe chnck block 72 and upon opposite sides ots-aid' block, and carriages G9 are correspondingly located with respect to the lower block ,74, As

shown inFig. 5 -each ot'thecarriages 68 and 69 has mounted'thereonizfslide vor die block 76, each of-which' slides has preferably, as shown infF ig. 6, a dovetailed" connection withl its respect-ive carriage.- .'The inner extreifnity of each'of these dieblocks carries a die or forming roll 77 or 77 which is .'revolubly Amounted therein and is substantially alined with a iange oranvil 78, one of `which is provided' around the lower face of' block 72 `andanother of which is disposed around the upper face of block 74. Cain groove rollers 79 are mounted upon "detachable blocks 79, which are attached in any suitable manner as by interlocking lugs and recesses SO,-as shown, tothe re? spective carriages (S8-69, and are adapted for engagement vwith the cani groove-s 'above referred to. Then therefore the chuck blocks 72 and 74 rotate, which they do in synchronisln, the' respectiye carriages G8 Will be caused. to approach andrecede from each other, While correspondingly carriages 69 will be similarly actuated. f v

y p The iiang'es or anvils 78 are of practically 'the saine shape as thecan and are respectively adapted to pass into depressions SO inthe top and bottom yoi thee-an," as shown in Fig. 7 ;the topl and bottoni of the can 81 in this instance being` identical. l

, 'The anvils or {tango-s 78 co-act with the respect-ive forming` rolls to seainthe cans when in` operati-on, and to thisend each die block Gvrec'eives an additional and independent niotion in thet'ollowing manner: Pivotedto each carriageat- S2, as lbest' shown in` Fig. G, is a short lever 8B which 'cari-ies upon its free end a roller 84. Substantially inidn-fay between the pivotal stud 82 and the -roller 84, thelever 83 is apertured orthel reception ot' a pin or bolt 85 whichprojects' 'laterally from "an adjustment' block 8G, each of these blocks being' adjustably yconnected to -a`l corresponding` dic-block 7 6, bynieans of a screw 87. K sets of brackets 70 Whiclrare in engagement with the rotatable guide rods 25and 36 are ,'cavinfsl'eevesSS, onev of these sleeyes being Mounted between the respective and each' sl cere in turn slowly reciprocate the blocks 86 and slides 76 along their respective carriages and thereby cause the dies or forming rollers to alternately approachand recede from the flange like anvils 7 8. The adjustment screws 87 permit the approach of the dies toward said anvils to be adjusted t'o a nicety; while the relative angular displacement of the cam grooves 88 with respect to each other determines the lag or retardation of one set of dies, z'. c. the finishing dies 77 behind the in turning dies 77; the purpose of which will be hereinafter referred to.`

It is obviousl of course that, by reason of the feathered connection betwen the rotatable guide shafts 25, 36, and the cam sleeves mountedv thereupon, the carriages when actuated by the cam grooved chuck blocks will be free to approach and recede from said blocks, carrying t-he cam sleeves and connected parts along with them.

Automatic stopping (Zeez'cal shall next consider the means employed for starting the driving mechanism and for automatically stopping the same. The bifurcated treadle lever 62 carries downwardly projecting through the central portion or stem thereof a short preferably cylindrical rodr 89 which is adapted for movement through said lever by having a feathered connection therewith. Secured to the lower extremity of this rod is a foot piece 90 which has laterally projecting therefrom a recessed extension 90 adapted for the reception of a portion of the foot of the operator. The upper extremity of rod 89 is headed and exA tends through a bracket 91 which is secured to the lever 62 in any suitable manner, the headed end of rod 89 being normally spaced slightly from the upper surface of the bracket 91 by means of springs 91", the upper extremities of which are attached to the respective arms-of the bifurcated foot lever, the lower ends of said springs being connected to the extension 90 of the foot piece 90. The pressure of the foot of the operator upon this foot piece hence urges said foot piece downwardly, carrying its supporting rod 89 down with it until the head of the latter engages bracket 91. Of course when the foot piece is released springs 91return .the foot piece to its upper position.

A roller 92 is mounted between suitable Ilugs which project rearwardly from the foot cured to the base. A spring 99 is disposed between the upper surface of member 96 and theY said-bracket so that the forward or roller engaging end of the lever 93 normally occupies its uppermost position, rod 97 being provided with a suitable collar 100 which serves'as a stop to prevent the lever being unduly raised.

Rod 97 is pivotally connected at 101 to a. crank-arm 102, which is mounted on a rockshaft- 103, being preferably keyed thereto. This rock-shaft has mounted upon its further extremity, as viewed in Fig. 1, a second crank-arm-104, to which is connected a link 105, shown in dotted lines in said figure, and

the upper extremity of which link is in turn connected to an arm 105', which is mounted upon a second rock-shaft 106, journaled in` its front extremity, as viewed in Fig. 1, .the

forked lever 107, the upwardly projecting arms of which carry rollers 108 which are disposed in engagementwith suitable flanges upon the sleeve 6, above referred to, which is mounted upon the shaft- 3. The lower extremity of lever 107 Ais connected with a spring 109, the other extremity Aof which is connected to-the bracket 2. By reason of this spring the said lever has a tendency toward clutch opening position; the sleeve 6 above mentioned carrying the clutch member 5 and brake member 7 in the manner above described.

The forward extremity of rock-shaft 103, as viewed in Fig. 1, carries 'a latch or finger 110 which is adapted for engagement with the hooked end of a short lever 111, the'latter being monnted at 112 upon the side of bracket- '.Q, and having its upper extremity pivotally connected to a part 113 into which is screwed a rod 114, this rod being preferably adjustable into and out of the part 113, whereby the overall length of these connecting elements may be varied for purposes of adjustment. The farther extremity of rod 114 is in like manner secured to a corresponding pivotedY part 115 which is connectcd to a `short crank-arm 116, which latter is in turn mounted upon a rock-shaft 117. The forward extremity ofthis shaft, as viewed'in Fig. .1, carries a pawl 11S, the extremity of which bears against the hub of the bevel gearQ. This hub is provided at one point thereon with a cam-like projection or trip 119, one face of which is preferably curved or beveled, and the other face of which is relatively abrupt.

Then the toe of the operator is inserted into the foot piece and the foot is thrust forward while correspondingly downwardly upon the foot piece, lever 62 will be swung around substantially into par-v allelism with the spindles 20--21, and the roller 92 will engage lever 93 depresslng pressing la'tterbein'ginormally held in latching posie j tionf'bymeansof'a spring 120. lWhile the rer'nity of lever 93 is beingde- Ie"-'fre,goin:gf manner, 'a hook v121, secured "upon vthe rear of the stem brfiifrca-tedfleve'r 62, will latch with a ooked nenber2122, lwhich is' fixed-ly mountd" fn Aroclshaft 123., This shaft is `?e.:u1fieCl--infsuitable:brackets 19A-+1247 and Z has secured the;` to, fatljacentlbracket 124:, a

@"'eianlr arm12v varm is slottedas at 1261 "f127fijlnch`is secured' `to the lower extremity ofvarodv 128.' The lower extremity of member!112754?` lsomewhat arcuately concaved onitis'fforward'faceto adapt it to'bearl lsnuel `'a'froller 130 which is carried; innerfside lofbracket 121, being norlnc'h also-^ disposed in said slot, a suit- @Yableflshoeqll -b'eingprovided between the.

fspiiinhiandf'tihe'iiiember 12T. As shown in -li'igg15 the roclr=slifaft123 also carries a short -farln w21-rigidly secured 'thereto inV any suit- 'able 111a1i ner,`4 andft-hrough this armi projects 'f affset?lscrewF'133iwhich is adapted to engage thefbafse -This screw serves. as a stop to Iflimitthe war-dfi movement of lever 125,

"'fhliasaftendency toward its upper posii byre'asonof its connection with-a pring 131;@ Tli'member '127 which 'for4 rea- "soirsf hereina-ftengreferred 'to may be termedv ifi :afriction'felemenq and its rod 128 also have' 'te'nfdencypinward@their upper ',position,

spring 135 being' connected in any suitable imanner to. the'ffriction element Vor member i las shown-#i511 L'Figz It is evident therefore t ff iatbyreasonfofispring 1311 the trveadle hook for ltclf 122fwill be normally in position'to thershook-121v and. tothereby lock re'adleleyerf62 in its vertical positon ided ufponithe rearside `of lever 62 which Elis vadapted @for 'engagementwith the head @Si en ncy 1v1-itsputereor,supper sposiy; i tinlfsrnceffsp fp re'ssecl; langere @15381; and

disposetl"rearward 'fathefisaid-'leverir l inganonnted iup on th'e'tbiracketgt byzforming it zungerwizhollow, and

venfthereagainst by a spring 13,0(-`

-ien?moved'thereinto. A .stop y'13G is pro-4 outward movement lof keach ,plunger :with respect to -its pinfll) lisf'liriii'teilly:`slo1:ting the stem of the plunger asat '142'l and provi'ding a small' pin 14:3which eiteirds laterally from the pin 14H0 yandprojeetsfintosaid 70 slot.- "In order to insure ainvariableout ward displacement"y lof *lever 62; *when 'f its latch is released; it-,i'said'ifisable 'that' auX- iliary spring pressed frnembe'rs" '14e/libe* providedwhich are aela-ptedf"foi engagement with theheads ofs'etsicrm when the plunger is"` ii these members exert'faconsi ei able-'tendency to lstart the same outwardly' whileaffterfit has beenonce 'so 'startedthe'lw' vkers'ly 146 of plungers 138 yco'ntim'll Iwa-rdly untilthe weight f lie-'par s up liftedby the toggles abftne`VA referred to? adapted" to'exert its 'elfb'rtand to thereby 'retain the lever in -its outermostf-posi'tion* Rod 128 isconnecte'dfwi' he rock-shaft 117 by meansof a crank?VVV securely mounted on'said s L: O72e1-atr0n.-'-Assuining`f j thatv `-"the fille is Constantly.runningffandjis normll" connected from the'shaft 3,hfe hi h ingfopen, and 'that"theibodyof' its top and bottom "1ne'inbers -h 'sembled as shown-'in 'Fig.7 fandv placed upon-the lower blo'krit as shown into thek pocket 90 ."and'leierl62 ,iVA inwardly` and downwardly 'iinifthef m above described, therebyeifectingfa'latcl ng' engagement betweenkk l'iooks11121fand 122 and substantially simultaneous/lf v"fdepre'ssingle'vf ver 93-and operating'ftheclutoh mechanism and releasing the brake'in the mannerabove described. Beforer however; gthis clutch lmechanism willhave beenoperat'ed, the' supporting block YQ-With ithaca'n-Vpartsfwill L? have been lifted by'the=`toggle faction: V'until Vthel top-fof the can isf-in?zengagementglwith 4'che block 72. 1 Thereafter both spindles1j20 and 24 will rotate in-synch'rfonis'rh at #considerable speed rand duringthe c'oi'irsefof'`-'suh "L1, rotation, the rotatable guidelrods125 and will' be Acaused torotate'gatfa muchrzslower rater-in this instance isuch;rods.,ii'ifaking one revolution' while the saidia spindles`r are'- anali-z ing twelve. This willrcusezfthe rleversSB tto swing inwardly toward the can about their pivotal points 82. Of c,ourse,-before;the ma'- chine starts the fformingi, vrolls g ,areaI :spaced fromsthefedge ofthe geen, .but as soon fasthe ,parts begneto rotate:thefcamjsleevesV88 ber more {in's the formingv rolls'byt moving tthev enel `fnA tlre i-i-nannerf alrgead .y;;de'-V scribed; an ietop and bottomnrollerse? nally; strike the edge; off the cover and: the dgeoflthe bottenrof thefeanshownn Fig. 'an `begin tol cui-1 tliefsaid Ledges over in j extend upwardly from said bracket?.4 65 o revolutions of the can being utilized to bring the respective edges to the shape shown. When the top and bottom seams have been thus partially formed by one setof the rollers,the other set, '77-77, on the other side of the can, whose slides h-avebee'n previously set \so th` t they cannot. come into action until the seams had been thus' partially formed, come into contact with their respective seams and gradually press them into the finished condition exemplitied in Fig. 9. hile this second set of forming rolls is at work upon.

'wardly and thereby rocks lever 125 about its pivotal axis, and thereby releases hook 121. The spring pressed plungers 1&4 and 138 above described then urge lever G2 abruptly outwardly, breaking the. toggleand lowering the block 71, thereby withdrawing the completed can from its engagement with the upper block 72.- The releasing of the latch 110 at the same time allows spring 109 to displace lever 107, and thereby open the clutch and throw the brake disks into operation, effectively bringing the mechanism to an almost immediate stop. This immediate action of the clutch releasing and' braking mechanism is possible by reason of the fact that the roller 9.2 was already out of engagement with its lever 93 even though the treadle lever had not as yetmoved outwardly, roller 92 being lifted free of lever 93 when the foot. of the operator is removed from the foot piece after starting the mechanism. The pressure 'exerted by spring 109 is adjustable within limits so that the actual braking force exerted may be varied,

and is in fact so adjusted to enable the ma chine to be turned over suiic'iently to permit cam 119 to just pass from under pawl 118, the latter thereupon assuming the position shown in Fig. 1; and the mechanism being then ready for seaming the next can.

The engagement between the reciprocable member 127 and lever 125 is a frictional one, the advantage of this construction being as follows: Then the treadle is operated and the hooked parts 121 and 122 are thereby engaged, hooked member 122 is forced to rotate and thereby swings lever 125 down wardly. W'ere it not for the frictional engagement between this mrt and the member 127, the latter would be pulled downwardly also, which would have displaced the latching element or lever 111, so that the machine would cease to operate as soon` as the foot was removed from the foot piece.v

The member 127 being however somewhat cam shaped and in engagement with roller 130 remains stationary in its uppermost position while the lever 125- is passing thereover, and when the said lever snaps upwardly due to the latching engagement of parts 121 and 122, it merely wipes upwardly again over member 127. On. the other hand, when member 127 moves downwardly, as when actuated by the cam or trip 119, its frictional engagement with lever 125 is suf cient to effect the release of the tre'adle in -the 'manner above described.

In lgeneral, in this machine, as in the one described in my patent above referred to, the dies are carriedin guides which permit them to reciprocate in a straight line so that they will act against the edges of the can and directly toward the center or axis of the same. All parts of the mechanism are, with exception of the initial actuation of the foot lever 62, operated entirely automatically in every respect, and all that is required of the operator is to put the can parts in position upon the lower block or chuck and to press-the treadle. The lockfingof the treadle and the automatic release of the same is believed to bea particularly meritorious feature; while the fact that itfis possible herein to automatically bring double sets of seaming rollsiinto contact with the work by mea'ns of straight line motions, is of especial importance. The double seaming' rolls further may be very accurately adjusted and perfect seams rolled at the highest speed, while other parts of v'che machine are correspondingly adapted to be adjusted to a nicety.

Vhile the increasein the output andthe saving in labor due to the herein described mechanism are very important items, one of the most advantageous features of this machine is that by its use cans with perfectly straight bodies can be made. Cans made in' a single end seamer, particularly when of large size, tend to twist, as the open end tends to drag the doubleseamed end. The fact that two separately but synchronously driven chucks are employed, entircly overcomes` this tendency` and both ends of the can are driven at the same speed and stop at the same point, from which it follows-that straight cans must result.

Having described my invention,y I claim:

1. In a can seaming machine, apair of' revoluble chucks, a. die movable toward and from ,one of said chucks, a reciproc'ably mounted support for said last mentioned chuck and its die, said chuck and die being movable toward and from the other of said chucks, mechanism for rotating said chucks in synchronisin, coperating mechanism for moving said die, said cooperating mechanism having rotatable elements carried by 'said reciprocably mounted support.

2. In a can sea-ming machine, a. pair of i revoluble chucks adapted tohold a can therebetween when seaming thesame, dies mov- .able toward and from each of said chucks,

a .fixed-support for onefo said chucks and .its die, a reciprocably mounted supportior- Athe otherof said chucks and its die, mechariasm for rotating said chucks in synchrocoperating mechanism- ;for/moving said dies, said coperating mechanism having a movable elementcarriedby said fixed support, and a synchronously movable element carried by said reciprocable support. 43. In a can s eaming machine, a plurality of can supporting elements, a seaming die',

mechanism for actuating said die and-elements, said mechanism comprising a clutch, meansfor approximating one of said can supporting elements toward' another, said means comprising afti'eadle, means for actuatingsa-id clutch' also operable by .said treadle, a-i treadle latch'for 'holding said treadle in' operative positionl when moved thereinto, automatic means for disengaging sa-id t-readle latch,"'said automatic disengaging means comprising treadle latch operating members `having affrictional clamping. engagement lwith each other..

4. In a can seai'ning machine, -a plurality of can supportingelements, -a seaming die, mechanism foratiuating said elements, said mechanism comprising. a clutch, means for approXim-a'tingfnei of saidcan supporting',

l elements towaji'd j 'another,` saidmeans com- 'prising a lever, .means' for actuating said; clutch alsoaopera'ble by said lever, a clutch latch for holding'-the parts of said clutch in operative relationship, a latchfor holding said leve'r operative position when and automatic means for' moved thereint disengagingboth" of said latches, said automat-ic means andlever 'latch having a slip connection therebetween, `whereby the clutch latch remains undisturbed when the lever is driveninto latching'position.'

5. In a can seaming machine, can supporting elements, a seeming' die, mechanism foractuating said elements, said mechanism comprising a clutch, means for approximating oneof said -can supporting elements toward another, -a'clutch latch for holding -the parts of said clutch inoperative relationship, a latch for-holding said means in operative position when moved thereintd,

and automatic means for disengaging both of said latches. c

6. In a can seaming machine, can supporting elements, a seeming die, mechanism for ship, latch for holding said means' in op- "ing, position.

7. In a can seaming inachine,a pair'of revoluble chucks, a. die movable toward and from veach of said ch'ucks, a reciprocably mounted support for one'of said chucks and its die, said chuck and die being movable toward and from the other of said chucks, mechanism for rotating said chucks 4in synchron'ism, cooperating mechanism for vmoving said die, said cooperating mechanism having a rotatable elementcarried by said` reciprocably mounted support.

8. In a can-seaming machine, a pair of Vrevoluble chucks,.mechanism for positively driving said chucks in synChrQniSm, sets of dies disposed adjacent said chucks, one set adjacent one of said chucks and t-he other set adjacent the other 'of said chucks, each 9 of said sets of dies comprising a curling die and anishingedie, said curling` die being mounted independently of saidv finishing die in each set, mechanism for moving said dies laterally toward and from-said chucks,

Vsaid mechanism comprising means for ad.- vancing. both of said curling 'dies toward their respective chucks in advance of said finishing dies, and means for moving one of said chucks toward and from the other i vof saidv chucks.

9. In a can seeming machine, a. .pair of chucks, sets of` dies disposed adjacent said vchucl'is,.fone set' adjacent one of said chucks and the other set adjacent the other of said 1 chucks, means for ell'ecting 'a relative rotary movement between said dies and chucks, each of said sets of dies comprising a curl ing die4 and a 4:finishing die, said curling die being mounted independently vof saidfillish: 1 ing die in each set, mechanism for moving said ydie'slaterally. .toward and 4from said chucks,- said mechanism Acomprising means for advancing both of said curling dies to- -Ward their respective chucks in advance of:

said finishingl dies, and means for moving one of said chucks toward and from the other of said chucks.

10. In a can seaming machine, a pair of chucks, sets of reciprocably mounted dies 1 disposed adjacent said chucks, one set adjacent one of said chucksand the other set adiacent the other of said chucks, means for dies toward and from said chucks, said effecting a relative rotary movement bechucks toward and from che other of said 10 tween said dies and chucks, each of said sets chucks.

of dies comprising a curling die and a nsh- In witness whereof, I subscribe my signa-4v ng die, mechanism for reciprocating said ture, n the presence of two witnesses.

mechanism comprising means for advancing CHARLES LEFFLER" both of sadlcurlng dies toward their re- AVVimesses: spectlve chucks 1n advance of said ulshlng ABRAHAM BRINKERHOFF, dles, and means for movmg one of sald JOSEPH HARLACH. 

